Job Description

Upwork is seeking a Senior Lead Machine Learning Engineer to shape the future of AI-powered intelligence. This role involves leading the design and delivery of infrastructure and models for agentic LLM workflows, spanning research to production, and driving innovation with measurable business results. It's a technical leadership position with opportunities to guide strategy, mentor others, and represent Upwork in the AI/ML community.

Responsibilities

• Design and implement resilient infrastructure for agentic LLM systems
• Lead training and fine-tuning of large-scale foundation models
• Partner with engineering, product, and research teams
• Mentor and support other engineers and researchers
• Drive experimentation and translate findings into production systems
• Identify opportunities for innovation
• Contribute to the external AI/ML community

Requirements

• Expertise in building, deploying, and scaling advanced ML models with Python and frameworks like PyTorch or TensorFlow
• Deep understanding of transformer-based models, generative AI, and agent architectures
• Experience training and optimizing large models on GPU clusters
• Track record of leading high-impact, cross-functional initiatives
• Collaborative mindset and clear communication skills

Benefits

• No benefits